Why not buy a sub from a company that just makes subs and has been around for a long time...like JL Audio (E110,E112) if you want PUNCH then these are the subs! Also....REL Acoustics (S series) seamless blending and low bass information retrieval with awesome beauty of tone and pace rhythm and timing with power!
http://www.jlaudio.com/home-audio-powered-subwoofers-e-sub
https://rel.net/product-category/subwoofers/serie-s
Matt M
http://www.jlaudio.com/home-audio-powered-subwoofers-e-sub
https://rel.net/product-category/subwoofers/serie-s
Matt M